Improved house-warming furnace



P. MARTIN.-

Hdt Air Furnace. I

No. 44,329,, Patented Sent. 20, 1864.

UNTTED STATES PATENT OFFICE.

PETER MARTIN, OF CINCINNATI, OHIO.

IMPROVED HOUSE-WARMING FURNACE.

Specification forming part of Letters Patent No. 44,329, dated September 20, 1864.

To aZZ whom it may concern:

Be it known that I, PETER MARTIN, of Gineinnati, in the county of Hamilton and State of Ohio, have invented a new and Improved Air-\Varming Furnace; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification.

My invention consists in an arrangement of of devices whereby the air is warmed to a healthy and agreeable temperature, without any danger of its being burnt by coming in contact with highly-heated metallic surfaces or of being contaminated by the absorption of smoke or other impurities.

Figures 1 and 2 are, respectively, a longitudinal and a transverse vertical section of a furnace embodying my improvements. Fig. 3 is a horizontal section through the line 00 m, Fig. 1. Fig. 4 is a plan of the crown-plate with the hot-water tank. Fig. 5 is a perspective view of my wood-burning fire-box.

The exterior shell of my furnace is composed of corrugated metallic plates A, whose lower edges are confined to the bed-plateB by means of flanges b I), and whose upper edges are secured to the crown plate 0. The corrugated form of the shell A affords great strength with a given weight of material and permits of expansion and contraction of the parts.

1) is the warmair chamber, its exterior surface being formed by the vertical plates d, horizontal plates d, and interior plates, d and E. This chamber receives its supply of air through openings F in the bed-plate B.

The air-warming tubes G are arranged in such a manner in the firechamber I (see Fig. 3) as to receive the full amount of heat without becoming so hot as to scorch the air. The upper parts of these tubes encircle flanges on the cast-iron plate E, and are attached at their said upper parts to short interior tubes, G, (see Fig. 2,) which, passing through openings in the cast plate E, are double-seamed to a sheet-metal plate, 6, which covers the cast plate E, and prevents any leakage of gas or smoke or other impurities of combustion into the air-warming chamber D. Thus, one prevalent and serious defect in air-warming apparatus is entirely obviated. This freedom from leakage will be preserved, even though the pipes G should become loose in the castiron plate E or the latter should become cracked, while the cast-iron plate, on its part, will, by its rigidity, act to sustain the Wroughtiron portion 0 against sagging. This arrangement entirely obviates the employment of litharge or other poisonous listing to close the joints. One of the tubes Gr may communicate directly with a distant apartment by means of a branch, G, such more direct communication favoring the passage of heat to a greater distance than would otherwise be the case. A wrought-iron band is placed between the tubes G and G, through which the rivets are passed which bind the said tubes together, thereby affording additional security for a tight joint and rendering the escape of gas impossible. The fresh-air chamber H receives its air by the pipe K, which is provided with an arrangement for cleansing the entering atmosphere of all dust, soot, and other impurities. To accomplish this purpose I provide a rotary screen having perforated vanes L L, which are caused to revolve by the entering current of air and which receive on their surfaces numerous jets of cold water from a rose, M. The constant revolution of the screen L L, in conjunction with the water which is poured upon it, precipitates all the dirt, which is then carried off through apipe,N.

O (see Figs. 1 and 3) is the fire-pot for burning coal. It is made in segments which are bolted together by lugs 0, so that when one part of the pot is burned out, it can be replaced by a fresh section without disturbing the other parts of the furnace.

P (see Fig. 5 and dotted lines in Figs. 1 and 3) is the wood-burning tire-box, 19 being a grated opening'in its bottom and p a bar for grasping the throat Z. This box can at any moment required, be secured in the position indicated by the dotted lines, its represented connection with the fire-pot O and throat Z, holding it firmly in position. This device enables the conversion of acoalinto a wood-burning furnace, and vice versa, in a few minutes.

It is the furnace-door, S the grate, T the ash-pan, and U the smoke-pipe. D

The crown plate 0 is provided with a hotwater tank, V, from the upper part of which, small pipes o v conduct steam into the warmair tubes W W.

Y is the pipe by which the tank V is supplied with Water and Y is the overflow pipe.

I claim herein as new and of my invention:

1. The provision in an air-warming furnace of an exterior shell formed of corrugated metallic plates A, in the described combination with the crown and bed platesB and O, as described.

2. The arrangement of warm-air chamber D, inclosing the furnace proper and provided with tubes Gr, interior tubes, G, in the manner and for the object described.

3. The sectional fire-pot O 0, formed and arranged in the manner and for the object stated. 4. The arrangement of provisions 0 0 P p 

